/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineNotificationTransportManager.h
Base function for letting the notifications flow
virtual [FOnlineTransportTapHandle](API\Plugins\OnlineSubsystem\Interfaces\FOnlineTransportTapHandle) OpenTap ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & User, const [FOnlineTransportTap](API\Plugins\OnlineSubsystem\Interfaces\FOnlineTransportTap) & Tap )